Pub Date : 2019-01-01DOI: 10.5220/0008932403120318
Riski Aulia Hasibuan, D. A. Nasution, B. Wirjosentono
: In this work, the PVA-based hydrogels containing various loading of microcrystal cellulose (MCC: 0; 0.2; 0.4; 0.6 and 0.8) g were prepared in a bench-scale reflux-reactor using water as a solvent in an optimized condition. Other constituents added, i.e. acrylic acid (AA) and N’N-Methylene bisacrylamide (MBA) as comonomers as well as ammonium persulphate ((NH4)2S2O8) as initiator was keeping their composition ratio constant. Products of the interpenetrating-hydrogels were cast in plastic mold and cooled, and then characterized. First of all, their absorption properties and were measured using swelling test to know optimum conditions and the next will be characterized with FTIR, DSC, and SEM. Results showed that the optimum composition ratio of PVA/AA/MCC/MBA/APS = 0.4/4/0.6/0.06/0.2 enhanced the water absorption. FTIR analysis of the film specimen after exhaustive extraction in n-hexane still contained stable AA-carbonyl (C=O) absorption peak at 1713 cm -1 of hydrogel 1 and 1707 cm -1 of hydrogel 4. The thermal properties of the optimized composition of the hydrogel 1 showed its stable decomposition temperature (thermal stability of 482.28 o C). Morphological properties of the interpenetrating-hydrogel micro composites also showed finely distributed of the micro filler, which is responsible for its improved mechanical and thermal properties.
:在本工作中，pva基水凝胶含有不同负载的微晶纤维素(MCC: 0;0.2;0.4;在优化条件下，以水为溶剂，在回流反应器中制备了0.6和0.8)g。以丙烯酸(AA)和N- N-亚甲基双丙烯酰胺(MBA)为单体，过硫酸铵(NH4)2S2O8为引发剂，使其组成比保持恒定。在塑料模具中浇铸并冷却后对其进行表征。首先，用溶胀试验测定了它们的吸收性能，确定了最佳条件，然后用FTIR、DSC和SEM对其进行了表征。结果表明，PVA/AA/MCC/MBA/APS的最佳配比为0.4/4/0.6/0.06/0.2，可提高吸水率。在正己烷中彻底萃取后的膜样，FTIR分析仍含有稳定的aa -羰基(C=O)，吸收峰位于水凝胶1的1713 cm -1和水凝胶4的1707 cm -1处。优化后的水凝胶1的热性能表现为其稳定的分解温度(热稳定性为482.28℃)，微填充物在渗透-水凝胶微复合材料的形态性能也表现为微填充物分布均匀，这是其力学性能和热性能得到改善的原因。
{"title":"Thermal and Morphological Properties of Polyvinyl Alcohol-based Hydrogel Containing Microcrystal Cellulose","authors":"Riski Aulia Hasibuan, D. A. Nasution, B. Wirjosentono","doi":"10.5220/0008932403120318","DOIUrl":"https://doi.org/10.5220/0008932403120318","url":null,"abstract":": In this work, the PVA-based hydrogels containing various loading of microcrystal cellulose (MCC: 0; 0.2; 0.4; 0.6 and 0.8) g were prepared in a bench-scale reflux-reactor using water as a solvent in an optimized condition. Other constituents added, i.e. acrylic acid (AA) and N’N-Methylene bisacrylamide (MBA) as comonomers as well as ammonium persulphate ((NH4)2S2O8) as initiator was keeping their composition ratio constant. Products of the interpenetrating-hydrogels were cast in plastic mold and cooled, and then characterized. First of all, their absorption properties and were measured using swelling test to know optimum conditions and the next will be characterized with FTIR, DSC, and SEM. Results showed that the optimum composition ratio of PVA/AA/MCC/MBA/APS = 0.4/4/0.6/0.06/0.2 enhanced the water absorption. FTIR analysis of the film specimen after exhaustive extraction in n-hexane still contained stable AA-carbonyl (C=O) absorption peak at 1713 cm -1 of hydrogel 1 and 1707 cm -1 of hydrogel 4. The thermal properties of the optimized composition of the hydrogel 1 showed its stable decomposition temperature (thermal stability of 482.28 o C). Morphological properties of the interpenetrating-hydrogel micro composites also showed finely distributed of the micro filler, which is responsible for its improved mechanical and thermal properties.","PeriodicalId":20533,"journal":{"name":"Proceedings of the 1st International Conference on Chemical Science and Technology Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75239491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5220/0008920002450248
Chintya Cahaya, M. Taufik, Z. Alfian, S. Lenny, R. Hidayati
PT Toba Pulp Lestari Tbk is a global pulp producing company that develops forest industry concessions and stores a variety of underutilized biodiversity such as Eucalyptus robusta leaves which are widely found around the PT Toba Pulp Lestari Tbk forest area. Eucalyptus robusta leaves produce oil that is used as liniment, cough medicine, perfume, soap, detergent, disinfectant and pesticides. Eucalyptus robusta and supports its antioxidant potential. Eucalyptus leaves are first described with several solvents, such as methanol, ethanol and dichloromethane. The potential of antioxidants using the DPPH method on the 1800 Uv-Vis Spectrometer. The antioxidant activity test was carried out with the DPPH method (1.1 diphenyl pikrilhidrazil) with a variation of sample volume 20; 30; 40; 50; 60 μL. Eucalyptus leaf extract showed antioxidant activity with IC50 of 8,386 μg / mL. The Eucalyptus leaf extract is categorized as providing weak antioxidant activity. Analysis of active composition that can be used in eucalyptus leaves using the GCMS method. The main compounds contained were cineol 52%.
{"title":"Identification and Analysis of Potential Antioxidants from Leaves of Eucalyptus robusta PT. Toba Pulp Lestari, Tbk.","authors":"Chintya Cahaya, M. Taufik, Z. Alfian, S. Lenny, R. Hidayati","doi":"10.5220/0008920002450248","DOIUrl":"https://doi.org/10.5220/0008920002450248","url":null,"abstract":"PT Toba Pulp Lestari Tbk is a global pulp producing company that develops forest industry concessions and stores a variety of underutilized biodiversity such as Eucalyptus robusta leaves which are widely found around the PT Toba Pulp Lestari Tbk forest area. Eucalyptus robusta leaves produce oil that is used as liniment, cough medicine, perfume, soap, detergent, disinfectant and pesticides. Eucalyptus robusta and supports its antioxidant potential. Eucalyptus leaves are first described with several solvents, such as methanol, ethanol and dichloromethane. The potential of antioxidants using the DPPH method on the 1800 Uv-Vis Spectrometer. The antioxidant activity test was carried out with the DPPH method (1.1 diphenyl pikrilhidrazil) with a variation of sample volume 20; 30; 40; 50; 60 μL. Eucalyptus leaf extract showed antioxidant activity with IC50 of 8,386 μg / mL. The Eucalyptus leaf extract is categorized as providing weak antioxidant activity. Analysis of active composition that can be used in eucalyptus leaves using the GCMS method. The main compounds contained were cineol 52%.","PeriodicalId":20533,"journal":{"name":"Proceedings of the 1st International Conference on Chemical Science and Technology Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89656884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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